Lately we winter in Florida so we miss most of the really hot weather. Most of the time all our windows and doors are all open. However, we run the aft AC covering the master, guest and both heads most of the time with the aft hatch and ports closed. This is more for marina soundproofing than anything else. (We're closer together than in a trailer park.) This cuts off the normal bow to stern airflow. So we keep the bow hatch and both galley windows open, all of which have screens. This contributes a bit to salon ventilation as well. I may turn the galley AC on briefly for cooking lunch but then I have to close all the salon doors to exclude those pesky flies. Last year between February and mid April I only had to run all four AC units on about four hot days using this plan. Kept the boat comfortable and minimized the electrical bill and AC wear. The front hatch has to go down for rain but the galley sliders are better as the screens lead rain down the frame and away. We renewed our galley frames and I recommend keeping the sliders.
